Process for making litharge and red lead



H. M. GABEL.

PROCESS FOR MAKING LITHARGE AND RED LEAD.

APPLICATION FILI-:D nec. 6, I9I9.

.d WQQSQ Patented June 21, 1921.

HENRY M. @AMEL F CINNAT, OYL.

IPRGESS EUR TEAKNG AND RED LEAD.

' .To all whom-it may concern.'

Be it known that l, HENRY Granen, a citizen of the United States, residing in Cincinnati, Hamilton county, Ohio, have invented certain new andl useful Improvements in Processes for Making Litharge and' lied Lead.

Thisinvention pertains to an improved process and apparatus for making litharge and red lead, and the invention will be readil understood from the following description taken in connection withthe accompanying drawing in which Figure 1 is a vertical longitudinal sec` tion of a furnace embodying the apparatus art of my present invention, the section Eeing taken in the plane of line 1 of Fig. 2':

Fig. 2 an end view ofthe furnace, the right hand end of Fig. 1: and

Fig. 3 a transverse section of the furnace in the plane of line 3 of Fig. l:

ln the-drawing: i i

l, indicates 4 Hanged wheels on 2 parallel shafts mounted in low standards on the floor of the apartment in which the apparatus is to be operated: 'i

2, gearing, of worm type, connecting the two shafts on which these wheels are mounted, this gearing to be operated continuously by power: v

3, a cylindrical metallic furnace-shell:

4, a pair of hoops surrounding the furnace-shell and bearingon the peripheries of-wheels 1 5, a rerick lining for the furnace-shell:

6, a layer of insulating material, as as-.

bestes, disposed between the rebrick lining andthe shell:

7, an axial inlet through one end wall of the furnace: 8, an axial outlet through the opposite .end wall of the furnace, this outlet being provided with a damper:

9, a charging-door disposed in a peripheral opening in the furnace: 10, a discharging door which may be provided in one of the end walls of the furnace,

this discharging door being at the extreme inner radius ofthe furnace:

11, a series of gas-burners, having a. suport exterior to one end of the furnace, these Eurners projecting through the inlet 7:

12, a gas supply-pipe; 13, gas-injection pipes leading from" the Specification of Letters fatent. patenting@ Jun@ 219 jlQiQL.

.Application filed December 6, 1919. Serial No.

acaben angle, so that the series of blades at one sideof the furnace will slope toward one end of the furnace while the blades 0f the series at the opposite side of the furnace slope toward the opposite end of thefurnace. "The furnace is to be charged with such quantity of granular metallic lead ,that a mass several inches indepth will be formed extending along the entire floor of the furnace.

rl`he gas burners are now to be ignited, the understanding being that oil instead of gas may be employed, the result'being that the burners supply heat to the i'nteriorof the furnace, the pipes 13, in `connection with the burners, acting as air injectors and serving to pass a volume of air through the furnace, the air being heated by the burners.

rlhe furnace is now'tobe started-into r0- tation, with the result that the blades pick up the lead and elevate it and discharge it toward one end of thev furnace, the two series of blades operating in alternation on the mass so that the mass lis given a shifting motion first toward one 'end and then to- Ward the other. end of the furnace, the mass, as it showers from the blades, and as it shifts in the furnace, becoming subjected to the. oxidizing action of the heated air. furnace is to rotate at the rate of about one turn in each live minutes, and, in the early stages of the process the heat in the furnace is to be maintainedat about `500 degrees Fahr., or below the melting point of lead.

rlhe process of oxidizing the lead is to be continued for from seven to ten hours. The temperature of the 'furnace may be raised `after the first few hours. rfhe result of the process is the formation of litharge or, expressed chemically rlhe litharge 4is in powdered form, very ,much finer, by reason of the tumbling acein lThe

tion of the mass in the furnace, than the granular lead with which the furnace was charged.

If this litharge product be not utilized as ePbO-l-OFePbsQL I claim The process of making litharge which comprises comminuting metallic lead and repeatedly and successively bringing the comminuted lead into contact with an oxi- 15 dizing gas and subjecting it to an abrasive action, the said oxidizing gas being heated during succeeding intervals of-time to temperatures for first drossing said lead and then converting the drossed lead into litharge. 20 HENRY M. GABEL.

Witnesses: v f

L. F. RATTERMAN, PHILOMENA. IFFLDMAN. 

